<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="./css/materialdesignicons.min.css">
    <style>

        .nav{
            /* 子元素想要用弹性布局技术，父元素就要设置 */
            display: flex;

            
            justify-content: space-between;
        }

        .nav .left{
            width: 37px;
        }
       
    </style>
</head>
<body>

    <div class="nav">
        <div class="left">
            <span class="mdi mdi-arrow-left"></span>
        </div>
        <div class="title">哈哈哈</div>
        <div class="right">
            <span class="mdi mdi-arrow-left"></span>
            <span class="mdi mdi-arrow-left"></span>
        </div>
    </div>

</body>
</html>